animate-path-from-by-animation-empty-by.tentative.html

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This WPT test may be referenced by the following Test IDs:
- /svg/animations/animate-path-from-by-animation-empty-by.tentative.html - WPT Dashboard Interop Dashboard

<!doctype html>

<title>SVG path 'd' from-by animation with empty 'by' value</title>

<link rel="help" href="https://svgwg.org/svg2-draft/paths.html#TheDProperty"/>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script src="/resources/SVGAnimationTestCase-testharness.js"></script>

<script src="support/animated-path-helpers.js"></script>

<svg>

  <path id="path" fill="green" d="M 40 40 L 60 40 L 60 60 L 40 60 Z">

    <animate id="animation" attributeName="d"

             from="M 10 10 L 90 10 L 90 90 L 10 90 Z" by=""

             begin="0s" dur="4s" fill="freeze"/>

  </path>

</svg>

<script>

const rootSVGElement = document.querySelector("svg");

// from-by with empty by: the empty by value cannot be added to the from

// value, so the animation is invalid. The base value is preserved throughout.

function sample1() {

  assert_animated_path_equals(path, "M 40 40 L 60 40 L 60 60 L 40 60 Z");

smil_async_test((t) => {

  const expectedValues = [

    ["animation", 0.001, sample1],

    ["animation", 2.0,   sample1],

    ["animation", 3.999, sample1],

];

  runAnimationTest(t, expectedValues);

});

</script>